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P. T. MARGHAND.

MAINTAINING POWER FOR GLOGK SPRINGS. No. 278,572

WITNESSES': INVENTOR:

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UNITED STATES PATENT OFFICE.

FRANCIS T. MAROHAND, QF AN NAPOLIS, MARYLAND.

MAINTAINING POWER FOR CLOCK-SPRINGS.

SPECIFICATION forming part of Letters Patent No. 278,572, dated May 29,1883.

Application filedMarch21, 1883. (No'modeL) To all whom it may concern Beit known that I, FRANCIS T. MARCHAND, of Annapolis, in the county ofAnneArundel and State of Maryland, have invented a new and Improved SpringMechanism for Clock- Works, of which the following is a full, clear, andexact description.

My invention consists in an improved gearing for the springs ofclock-work and all springactuated mechanism, and has the object toprevent the retardation of the mechanism while being wound, and insureuniformity in the action of the spring, whether fully or partiallywound.

Reference is to be had to the accompanying drawings,formingapart ofthisspecification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is an elevation of my improved spring mechanism. Fig. 2 is asectional side view of the same. Fig. 3 is an elevation in reverse ofFig. 1, and Fig. 4 is a face view with one disk removed.

A represents the clock-work frame. a is the winding-arbor, having aratchet-wheel, b, and pawl at one end, and 0 is the spring. d e are twodisks connected together by pins f'at their edges, with space betweenfor the spring on arbor a, supported by a sleeve, 9, projecting fromdisk 0. The two disks are formed with radial slots h, receiving a pin,t, to which the outer end of the spring is connected, the other end ofthe spring being connected to the arbor a. On the end of the arborprojectingthrough disk 01 is a pinion, 70, that engages a gear-wheel, I,mounted on a stud projecting from disk (I; and m isa pinion connected towheel I and engaging a rack, n, which extends across the face of thedisk to the pin i, which is connected to the rack. 0 is a bridgeretaining the rack in place. 19 is a gear-wheel on sleeve g for drivingthe clock-work.

With this gearing, when the arbor is turned to wind the spring, thepinion k, acting through the intermediate wheels, lm, causes the rack tomove in a direction to draw the pin 6 and the end of the spring inward,the pin moving in the slots h. As the spring unwinds, the disks d e arerotated, and gear-wheel l, moving with the disks, is rotated, and therack being thus moved in the reverse direction, the end of spring iscarried outward. In this man ner the leverage of.the spring on the disksis increased in proportion as the power of the spring diminishes inunwinding, thus insuring uniformity in its action. Further, the work isnot retarded by the winding, as the spring continues to exert its poweron the disks.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent 1. The spring mechanism. for clock-work, consisting ofslotted disks d e, rack 02, gearing .k l m, arbor a, and springconnected to the arbor and to the rack, combined and arrangedsubstantially as described.

2. In clock-work, the combination, with the driving-spring and arbor, ofslotted disks, and a rack connected to the outer end of the spring andmoved by connections from the arbor, substantially as shown anddescribed.

FRANCIS T. MAROHAND.

Witnesses:

ROBERT E. WELGH,

GEORGE MARGHAND.

